Hanging idle on a 94 gt

[dczsvt]

so ive been trying to solve this issue and have had NO luck whatsoever. i checked the tps voltage and the voltage was fine, changed iac, distributor, plugs, wires, cap, rotor, cleaned mass air, cleaned tb, cleaned air temp sensor, replaced dryrotted vac lines, new o2 sensors, new 255lph fuel pump, new fuel filter, tried installing a "custom restictor plate" (had read about in another forum) and still no fix, if i unplug the iac it runs great, just a pita to start...i had thought about running a toggle switch to the iac but would rather just get it fixed the right way...any of you guys had this problem before?

ive also ran codes at ford and here is what i got
176/181/332/172/136

 

[silverv6]

same thing happens on my 01..

 

[dczsvt]

i messed with it a lil while ago and left the iac unplugged and raised the idle a little, turned off the car, unplugged the battery, but oil in the car, fired it up and it had no problem starting, went straight at an idle, drove fine.....i think ill leave it at that until i get the turbo on and get it tuned. maybe while theyre tuning it they can fix the hanging idle or something

 

[rz5.0]

Fix your codes.
136 lean
172 lean
176lean
181lean
332Egr
You are running crazy lean even when the computer conpesates by adding more fuel disconecting the iac is not going to solve your issue. Your no getting enough fuel or you have a crazy vac leak. And fix your egr.

 

[yehaw-yellow]

i mad a restrictor plate for my iac and car runs great... then again every car is different.

 

[MustangChris]

i suggest clearing codes, starting from there...

after that, replace IAC.
after that, look into a restrictor plate.
after that, look into throttle idle screw, maybe not move it, but make sure it's actually there.
after that, make sure your idle hole on the throttle plate isnt clogged (if applicable)
.. . . .. .. .. most people find the restrictor plate to be the way to fix this.

 

[rz5.0]

I would not change the iac if im not getting a code fot it. Check the voltage make sure it changes as you move the throtle Cause it can get expensive if you just start changing random parts.

 

[rz5.0]

Hanging idle is usually a vac leak. Egr will also cause wierd idle issues.

 

[dczsvt]

previous owner also replaced egr not too long before i bought it, im gunna see how the tps voltage changes here in a minute and get back to you guys on it

 

[Orange Stang]

my gt had a bad hanging idel but the TPs sensor died according to the code pulled. soooo i replaced that no problems since

 

[dczsvt]

checked the tps voltage and now its at 1.04v, i slowly moved it and it slowly moved all the way to 4.68v at WOT

 

[rz5.0]

Close enough. Your still have an egr code so something wrong there. Check ALL VAC LINES.

 

[dczsvt]

ill do that again tomorrow when i replace the front and rear seal

 

[fastbanshee1999]

any update?

 

[dczsvt]

sorry about the delay, been very busy with work then working on the car...for those of you who dont know already i have pulled the motor and am currently cleaning it up and putting it back together...during the teardown process the only thing i found is that i had absolutely no pcv valve...ill try and upload pictures here when i get the time to

 

[extreme_21]

Fix your codes.
136 lean
172 lean
176lean
181lean
332Egr
You are running crazy lean even when the computer conpesates by adding more fuel disconecting the iac is not going to solve your issue. Your no getting enough fuel or you have a crazy vac leak. And fix your egr.

I second that...vaccuum pump the lines and see if it holds, if you can't pump it indicating a leak, smoke test it and trace your leak...all faults you describe and your the faults your car flags are all indicating to much air/lean..aka vaccuum leak either with lines or egr vaccuum due to error code 332: Insufficient EGR Flow Detected

 

[dczsvt]

as my previous post says the motors been pulled. when i put it back together new vac lines will be used and no smog will be used